My answer is too long so I’ll just put it in the comments
1. A mutation is a "Change" <span>in the nucleotide sequence of a gene within the DNA molecule.
2.</span><span>Chemicals that cause a mutation are known as "Mutagens"
Hope this helps!</span>
3. Two plates move away from one another
4. By subduction at deep sea trench
No, organisms include plants and animals, animals need food to survive, plants do not